Nautiloids - Rayzor Ranch, Denton Co., TX

Kingdom: Animalia, Phylum: Mollusca, Class: Cephalopoda, SubClass: Ammonoidea, Order: Ammonitida

Kingdom: Animalia, Phylum: Mollusca, Class: Cephalopoda, SubClass: Nautiloidea, Order: Nautilida

In Denton County,TX at the Rayzor Ranch, we found several different types of nautiloids and ammonites. First we found Cymatoceras sp, which is a nautiloid. In addition, we found Mariella worthensis (similar to turrilites) of all sizes, up to about 7 inches in diameter and up to 10 inches tall. Their ornamentation is very beautiful and make them very distinctive. We also found Metengonoceras sp fragments in abundance. This is in the Cretaceous Grayson Marl Formation (c. 97mya). 

 

Click on images to enlarge.

Mariella worthensis #646

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #646b

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #646d

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #646e

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #646f

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #646g

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #646h

Grayson Marl Formation

Denton Co., TX

 

Mariella worthensis #646i

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #646j

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #647

Grayson Marl Formation

Denton Co., TX

Metengonoceras #654

Grayson Marl Formation

Denton Co., TX

Metengonoceras #654b

Grayson Marl Formation

Denton Co., TX

Metengonoceras #654c

Grayson Marl Formation

Denton Co., TX

Metengonoceras #654d

Grayson Marl Formation

Denton Co., TX

Metengonoceras #654f

Grayson Marl Formation

Denton Co., TX

Cymatoceras sp #657 Grayson Marl Formation Denton Co., TX

Cymatoceras sp #657

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #681

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #682b

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #682

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #683

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #683b

Grayson Marl Formation

Denton Co., TX

Cymatoceras #1053 Grayson Marl Formation Denton Co., TX

Cymatoceras #1053

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #683c

Grayson Marl Formation

Denton Co., TX

Cymatoceras #1054

Grayson Marl Formation

Denton Co., TX

Mariella worthensis #684

Grayson Marl Formation

Denton Co., TX

Cymatoceras #621

Grayson Marl Formation

Denton Co., TX